WEBSTER RESERVOIR

1996 SEDIMENTATION

SURVEY

fg FOR THE ,

RE5O1i

URERE

U.S. Department of the Interior

Bureau of Reclamation
REPORT DOCUMENTATION PAGE I OMBNoO4-O188

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1. AGENCY USE ONLY (Leave Blank) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED

August 1997 Final _____________________________

4. TITLE AND SUBTITLE 5. FUNDING NUMBERS

Webster Reservoir PR

1996 Sedimentation Survey

6. AUTHOR(S)

Ronald L. Ferrari ____________________________

7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION

REPORT NUMBER

Bureau of Reclamation, Technical Service Center, Denver CO 80225-0007 ____________________________

9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING

AGENCY REPORT NUMBER

Bureau of Reclamation, Denver Federal Center, P0 Box 25007, DIBR

Denver CO 80225-0007 ___________________________

11. SUPPLEMENTARY NOTES

Hard copy available at Bureau of Reclamation Technical Service Center, Denver, Colorado

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Available from the National Technical Information Service,

Operations Division, 5285 Port Royal Road, Springfield VA 22161 ____________________________

13. ABSTRACT (Maximum 200 words)

The Bureau of Reclamation (Reclamation) surveyed the underwater area of Webster Reservoir in May 1996 to

develop a topographic map and compute a present storage-elevation relationship (area-capacity tables). The data

were also used to calculate reservoir capacity lost due to sediment accumulation since dam closure on May 3, 1956.

The survey used sonic depth recording equipment interfaced with a global positioning system (GPS) that gave

continuous sounding positions throughout the underwater portion of the reservoir. Underwater topography was

developed by a computer program using collected data. Above-water topography was determined by digitizing

contour lines from the U. S.Geological Survey quadrangle (USGS quad) maps of the reservoir area developed from

aerial photography obtained in 1951, 1967, and 1978. The new topographic map of Webster Reservoir is a

combination of digitized contours and 1996 underwater measured topography.

As of May 19, 1996, at top of active conservation elevation (feet) 1,892.45, the surface area was 3,767 acres, the total

capacity was 76,157 acre-feet, and the active capacity was 71,926 acre-feet. Since initial filling in May 1956, about

1,267 acre-feet of sediment have accumulated in Webster Reservoir below elevation 1884.6 (spillway crest), resulting

in a 1 .64 percent loss in reservoir volume. Since 1957, the estimated average annual rate of reservoir capacity lost to

sediment accumulation is 31 .7 acre-feet. ______________________

14. SUBJECT TERMS 15. NUMBER OF PAGES

d i ! sedimentationf reservoir surve s! sonar! sediment i

24 reservo r area an capac ty y

distribution! contour area! reservoir area! sedimentation survey! global positioning system 16. PRICE CODE

17. SECURITY CLASSIFICATION 18. SECURITY CLASSIFICATION 19. SECURITY CLASSIFICATION 20. UMITATION OF ABSTRACT

OF REPORT OFThIS PAGE OF ABSTRACT

UL UL UL UL

NSN 7540-01-280-5500 Standard Form 298 (Rev. 2-89)

Prescribed by ANSI Std. 239-18

298-102
WEBSTER RESERVOIR

1996 SEDIMENTATION SURVEY

by

Ronald L. Ferrari

Sedimentation and River Hydraulics Group

Water Resources Services

Technical Service Center

Denver, Colorado

August 1997
CONTENTS

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Introduction 1

Summary and Conclusions 2

Reservoir Operations 2

Hydrographic Survey Equipment and Method 3

GPS Technology and Equipment 3

Survey Method and Equipment 5

Reservoir Area and Capacity 6

Topography Development 6

Development of 1996 Contour Areas 8

1996 Storage Capacity 8

Reservoir Sediment Analyses 9

References 11

TABLES

Table

1 Reservoir sediment data summary 12

2 Summary of 1996 survey results 14

FIGURES

Figure

1 Webster Reservoir location map 15

2 Webster dam, plan and section 16

3 Webster Reservoir end-of-month elevations for 1956 through 1996 17

4 Webster 1996 underwater collected data 18

5 Webster Reservoir topographic map 19

6 1996 area and capacity curves 20

7 Webster Reservoir range line location 21

8 Webster Reservoir sediment range line 2 22

9 Webster Reservoir sediment range line 3 23

10 Webster Reservoir sediment range line 4 24

111
ACKNOWLEDGMENTS

The Bureau of Reclamation's (Reclamation) Sedimentation and River Hydraulics Group

of the Technical Service Center (TSC) prepared and published this report. Ronald

Ferrari and James Melena of the TSC conducted the hydrographic survey. Special thanks

to Mr. Robert Schamel and Mr. David Grooms, of the Great Plains Region, for the field

assistance during the hydrographic survey. Ronald Ferrari completed the data processing

needed to generate the new topographic map and area-capacity tables. Sharon Nuanes

of the TSC completed the USGS contour digitizing and was consulted during the map

development. James Melena of TSC performed the technical peer review of this

documentation.

U.S. Department of the Interior

Mission Statement

The mission of the Department of the Interior is to protect and provide access to our

Nation's natural and cultural heritage and honor our trust responsibilities to Tribes.

The information contained in this report regarding commercial products or firms may not

be used for advertising or promotional purposes and is not to be construed as an

endorsement of any product or firm by Reclamation.

The information contained in this report was developed for Reclamation; no warranty as

to its accuracy, usefulness, or completeness is expressed or implied.

11
INTRODUCTION

Webster Dam and Reservoir are principal features of the Solomon Division-Webster Unit of the

Pick-Sloan Missouri Basin Program. Additional unit features are the dike, four pumping plants,

Woodson Diversion Dam, and Osborne Canal, laterals, and drains. Webster Dam and Reservoir

are located in Rooks County of north-central Kansas about 8 miles west of Stockton. The

reservoir is on South Fork Solomon River (fig. 1).

Webster Dam was constructed between 1952 through 1956 with first storage on May 3, 1956.

The dam, a modified homogeneous earthfihl embankment with a cutoff trench, has dimensions of

(fig. 2):

• Hydraulic height' 86.7 feet

• Structural height 154 feet

• Top width 30 feet

• Crest length 10,720 feet

• Crest elevation 1,944 feet

A 2,640-feet long, rolled-earthfill dike, with a maximum height of 12 feet above the original

ground surface, closes a low saddle to the northwest of the left abutment of Webster Dam and

provides flood storage impoundment.

Webster Dam's spiliway, located in the left abutment, consists of an inlet channel, two intake

floatwells, an overflow crest, spiliway bridge above the crest, gated structure controlled by three

33.3- by 39.5-foot counterweighted radial gates, chute, stilling basin, and outlet channel. The

gates are designed for automatic and manual operation. The automatic float operation of the

radial gates occurs when water flows into unvalved orifices of two floatwells where at reservoir

elevation 1,923.7 (feet)2 the radial gates begin to open. The gates can be manually opened to

obtain greater releases then the automated system and to make releases when the storage level is

above elevation 1,892.45, the allocated flood control space. The spillway crest is at elevation

1,884.6. The downstream safe river channel capacity is 2,400 cubic feet per second (cfs). The

discharge capacity is 138,000 cfs at reservoir elevation 1,938.0 (Bureau of Reclamation, 1981).

The gated outlet works are near the right abutment through the base of the dam. The outlet

works consist of an inlet channel with trashrack, gate chamber, 3.5- by 3.5-foot emergency slide

gate, 48-inch-diameter steel outlet pipe, 3.5- by 3.5-foot regulating slide gate, control house,

stilling basin, and an outlet channel to the downstream canal entrance The discharge capacity is

380 cubic feet per second at reservoir elevation 1,892.45.

1The definition of such terms as "hydraulic height," "structural height," etc. may be

found in such manuals as Reclamation's Design of Small Dams and Guide for Preparation of

Standing Operating Procedures for Dams and Reservoirs or ASCE's Nomenclature for

Hydraulics.

2Elevation levels are shown in feet.
Webster Reservoir stores water from the South Fork Solomon River. The drainage area above

the dam is 1,150 square miles ranging from elevation 1,860.0, top of inactive pooi, to greater

than elevation 3,450 at its headwaters. The reservoir length at elevation 1,890 is around 6 miles

with an average width of 1 mile.

SUMMARY AND CONCLUSIONS

This Reclamation report presents the 1996 results of the first extensive survey of Webster

Reservoir. The primary objectives of the survey were to gather data needed to:

• develop reservoir topography

• compute area-capacity relationships

• estimate storage depletion caused by sediment deposition since Webster Dam closure

The bathymetric survey was run using sonic depth recording equipment interfaced with a

differential global positioning system (DGPS) capable of determining sounding locations within

the reservoir. The system continuously recorded depth and horizontal coordinates of the survey

boat as it was navigated along grid lines covering Webster Reservoir. The positioning system

provided information to allow the boat operator to maintain course along these grid lines. Water

surface elevations recorded by a Reclamation gage during the time of collection were used to

convert the sonic depth measurements to true reservoir bottom elevations.

The 1996 underwater surface areas at predetermined contour intervals were generated by a

computer graphics program using the underwater collected data. The above-water reservoir

contours were digitized from U.S. Geological Survey 7.5 minute quadrangle (USGS quad) maps

of Webster Reservoir. The new topographic map of Webster Reservoir is a combination of the

digitized and underwater measured topography. The area and capacity tables were produced by a

computer program that uses measured contour surface areas and a curve-fitting technique to

compute area and capacity at prescribed elevation increments. The 1996 area and capacity tables

were generated using the 1996 measured areas at elevation 1880.0 and less and the original

measured areas for elevation 1890.0 and greater.

Table 1 contains a summary of Webster Reservoir's watershed characteristics for the 1996

survey. The 1996 survey determined that the reservoir has a storage capacity of 76,157 acre-feet

and a surface area of 3,767 acres at reservoir elevation 1,892.45 feet. Since closure in 1956, the

reservoir has accumulated a sediment volume of 1,267 acre-feet below reservoir spillway crest

elevation 1,884.6. This volume represents a 1.64 percent loss in capacity and an average annual

loss of 31.7 acre-feet.

RESERVOIR OPERATIONS

Webster Reservoir is primarily an irrigation and flood protection facility (the following values

are from May 1996 area-capacity tables):

140,912 acre-feet of surcharge storage between elevations 1,923.7 and 1,938.0.
• 183,353 acre-feet of flood control between elevations 1,892.45 and 1,923.7.

• 71,926 acre-feet of active conservation storage between elevations 1,860.0 and 1,892.45.

• 3,185 acre-feet of inactive storage between elevations 1,855.0 and 1,860.0.

• 1,046 acre-feet of dead storage below elevation 1,855.0.

The Webster Reservoir inflow and end-of-month stage records in table 1 show the inflow and

aimual fluctuation for the operation period May 1956 through May 1996. The average inflow

into the reservoir for this operation period was 36,598 acre-feet per year. Figure 3 shows the

extreme storage fluctuations of Webster Reservoir, ranging from elevation 1,855.2 to 1,899.6 in

1957 to the maximum elevation on record, elevation 1,907.0, on June 5, 1995. The records show

the reservoir has operated in the inactive zones, below elevation 1860.0, during the years 1971,

1972, 1991, and 1992 and at low reservoir content, below elevation 1870, between the years

1967 through 1978, 1980 through 1987, and 1989 through 1993.

HYDROGRAPHIC SURVEY EQUIPMENT AND METHOD

The hydrographic survey equipment was mounted in the cabin of a 24-foot tn-hull aluminum

vessel equipped with twin in-board motors. The hydrographic system contained on the survey

vessel consisted of a global positioning system (GPS) receiver with a built-in radio and an

omnidirectional antenna, a depth sounder, a helmsman display for navigation, a plotter, a

computer, and hydrographic system software for collecting underwater data. Power to the

equipment was supplied by an on-board generator.

The shore equipment included a second GPS receiver with a built-in radio and an

onmidirectional antenna. The GPS receiver and antenna were mounted on a survey tripod over a

known datum point. The power for the shore unit was provided by a 12-volt batteiy.

GPS Technology and Equipment

The positioning system used at Webster Reservoir was Navigation Satellite Timing and Ranging

(NAVSTAR) GPS, an all-weather, radio-based, satellite navigation system that enables users to

accurately determine three-dimensional position. The NAVSTAR system's primary mission is to

provide passive global positioning and navigation for land-, air-, and sea-based strategic and

tactical forces and is operated and maintained by the Department of Defense (DOD). The GPS

receiver measures the distances between the satellites and itself and determines the receiver's

position from intersections of the multiple-range vectors. Distances are determined by accurately

measuring the time a signal pulse takes to travel from the satellite to the receiver.

The NAVSTAR system consists of three segments:

The space segment is a network of 24 satellites maintained in precise orbit about 10,900

nautical miles above the earth, each completing an orbit every 12 hours.

The ground control segment tracks the satellites, determining their precise orbits.

Periodically, the ground control segment transmits correction and other system data to all

the satellites, and the data are then retransmitted to the user segment.
• The user segment includes the GPS receivers which measure the broadcasts from the

satellites and calculate the position of the receivers.

The GPS receivers use the satellites as reference points for triangulating their position on earth.

The position is calculated from distance measurements to the satellites that are determined by

how long a radio signal takes to reach the receiver from the satellite. To calculate the receiver's

position on earth, the satellite distance and the satellite's position in space are needed. The

satellites transmit signals to the UPS receivers for distance measurements along with the data

messages about their exact orbital location and operational status. The satellites transmit two "L"

band frequencies (called LI and L2) for the distance measurement signal. At least four satellite

observations are required to mathematically solve for the four unknown receiver parameters

(latitude, longitude, altitude, and time); the time unknown is caused by the clock error between

the expensive satellite atomic clocks and the imperfect clocks in the GPS receivers (for

hydrographic surveying the altitude, Webster's water surface elevation parameter was known,

which realistically meant only three satellite observations were needed to track the survey vessel;

during the Webster Reservoir survey, the best 6 available satellites were used for position

calculations).

The GPS receiver's absolute position is not as accurate as it appears in theory because of the

function of range measurement precision and the geometric position of the satellites. Precision is

affected by several factors----time, because of the clock differences, and atmospheric delays

caused by the effect on the radio signal of the ionosphere. Geometric dilution of precision

(GDOP) describes the geometrical uncertainty and is a function of the relative geometry of the

satellites and the user. Generally, the closer together in angle two satellites are from the receiver,

the greater the GDOP. GDOP is broken into components: position dilution of precision (x,y,z)

(PDOP) and horizontal dilution of precision (x,y) (HDOP). The components are based only on

the geometry of the satellites. The PDOP and HDOP were monitored during the Webster

Reservoir Survey, and for the majority of the time they were less than 3, which is within the

acceptable limits of horizontal accuracy for Class 1 and 2 level surveys (Corps of Engineers,

1991).

An additional and larger error source in GPS collection is caused by false signal projection,

called selective availability (S/A). The DOD implements S/A to discourage the use of the

satellite system as a guidance tool by hostile forces. Positions determined by a single receiver

when S/A is active can have errors of up to 100 meters.

A method of collection to resolve or cancel the inherent errors of GPS (satellite position or S/A,

clock differences, atmospheric delay, etc.) is called differential GPS (DGPS). DGPS was used

during the Webster Reservoir survey to determine positions of the moving survey vessel in real

time. DGPS determines the position of one receiver in reference to another and is a method of

increasing position accuracies by eliminating or minimizing the uncertainties. Differential

positioning is not concerned with the absolute position of each unit but with the relative

difference between the positions of two units, which are simultaneously observing the same

satellites. The inherent errors are mostly canceled because the satellite transmission is essentially

the same at both receivers.

4
At a known geographical benchmark, one GPS receiver is programmed with the known

coordinates and stationed over the geographical benchmark. This receiver, known as the master

or reference unit, remains over the known benchmark, monitors the movement of the satellites,

and calculates its apparent geographical position by direct reception from the satellites. The

inherent errors in the satellite position are determined relative to the master receiver's

programmed position, and the necessary corrections or differences are transmitted to the mobile

GPS receiver on the survey vessel. For the Webster Reservoir, position corrections were

determined by the master receiver and transmitted via a ultra-high frequency (UHF) radio link

every 3 seconds to the survey vessel mobile receiver. The survey vessel's GPS receiver used the

corrections along with the satellite information it received to determine the vessel's differential

location. Using DGPS resulted in positional accuracies of I to 2 meters for the moving vessel

compared to positional accuracies of 100 meters with a single receiver.

The Technical Service Center (TSC) mobile and reference GPS units are identical in construction

and consist of a 6-channel Li coarse acquisition (C/A) code continuous parallel-tracking

receiver, an internal modem, and a UHF radio transceiver. The differential corrections from the

reference station to the mobile station are transmitted using the industry standard Radio

Technical Commission for Maritime Services (RCTM) message protocol via the UHF radio link.

The programming to the mobile or reference GPS unit is accomplished by entering necessary

information via a notebook computer. The TSC's GPS system has the capability of establishing

or confirming the land base control points by using notebook computers for logging data and

post-processing software. The GPS collection system has the capability to collect the data in

1927 or 1983 North American Datums (NAD) in the surveyed area's state plane coordinate

system's zone. For Webster Reservoir, the data were collected in the Kansas's 1927 NAD north

state plane zone.

Survey Method and Equipment

The Webster Reservoir hydrographic survey collection was conducted on May 17 through May

19, 1996, between water surface elevations 1,894.76 and 1,894.80. The bathymetric survey was

run using sonic depth recording equipment interfaced with a DGPS capable of determining

sounding locations within the reservoir. The survey system software continuously recorded

reservoir depths and horizontal coordinates as the survey boat moved across close-spaced grid

lines covering the reservoir area. Most of the transects (grid lines) were run primarily in a

north-south direction. Data were also collected along the shore as the boat traversed to the next

transect and as it maneuvered in the open areas between the trees. Thick tree growth prevented

the boat from reaching some areas of the reservoir, such as those near the shoreline or in shallow

water areas in the main body of the reservoir. In some areas the growth was so thick the survey

vessel ended the collection in 16 feet of water, at approximately bottom elevation 1878. This

included areas of the reservoir in the upper north shore and some portions of the lower south

shore. The survey vessel's guidance system gave directions to the boat operator to assist in

maintaining course along these predetermined lines. During each run, the depth and position

data were recorded on the notebook computer hard drive for subsequent processing by TSC

personnel. The underwater data set includes 24,477 data points. A graph plotter was used in the

field to track the boat and ensure adequate coverage during the collection process. The water

5
surface elevation recorded by a Reclamation gage during the time of collection was used to

convert the sonic depth measurements to true lake bottom elevations.

For stationing the master GPS unit there were no known benchmarks or datums that overlooked

the reservoir. For the underwater collection the hydrographic survey crew established a datum

using the hydrographic GPS units and software. In establishing the control for the reference

datum, the second-order National Geodetic Survey's benchmark Alcona, located several miles

from the reservoir, was used. The control was brought in from the Alcona benchmark to a pipe

near the basketball court at a church campground located west of the dam. This method

calculated 1927 NAD state plane coordinates of North 391,080.156 and East 1,586,802.053 at

this location. The shore-based master GPS unit, which transmits the correction information to

the mobile GPS unit on the survey vessel, was stationed at this site throughout the survey. This

location was chosen because it was accessible, near the reservoir, and overlooked the reservoir.

The location allowed for good radio transmission of the differential corrections to the mobile

survey vessel throughout the reservoir survey. During post-processing of the collected data, the

few collected points without differential correction were removed.

The underwater data was collected by a depth sounder which was calibrated by lowering a

deflector plate below the boat by cables with known depths marked by beads. The depth sounder

was calibrated by adjusting the speed of sound, which can vary with density, salinity,

temperature, turbidity, and other conditions. The collected data were digitally transmitted to the

computer collection system via a RS-232 port. The depth sounder also produces an analog hard

copy chart of the measured depths. These graphed analog charts were printed for all survey lines

as the data was collected and recorded by the computer. The charts were analyzed during post

processing, and when the analog charted depths indicated a difference from the recorded

computer bottom depths, the computer data files were modified.

RESERVOIR AREA AND CAPACITY

Topography Development

The topography of Webster Reservoir was developed from the 1996-collected underwater data

and from the USGS quad maps. The upper contours of Webster Reservoir were developed by

digitizing the contour lines of elevation 1,880.0, 1890.0, 1892.0, 1900.0, 1910.0, and 1,924.0,

from the USGS quad maps that covered the Webster Reservoir area. The USGS quad maps were

developed from aerial photography dated 1951, 1967 and 1978. ARC/INFO V7.0.2 geographic

information system software was used to digitize the USGS quad contours. The digitized

contours were transformed to Kansas' NAD 1927 north state plane coordinates using the

ARC/INFO PROJECT command.

Following are the resulting ARC/INFO digitized areas from the USGS quad contours compared

to the original contour areas reported in May 1956:

(1) USGS 1880 contour area was 2,474 acres, or 99.5% of the original area of 2,486 acres

(2) USGS 1890 contour area was 3,269 acres, or 94% of the original area of 3,487 acres

(3) USGS 1892 contour did not exist on all quads

6
(4) USGS 1910 contour area was 5,916 acres, or 98.5% of the original area of 6,010 acres

(5) USGS 1924 contour area was 8,337 acres, or 97.6% of the original area of 8,540 acres

Except for elevation 1890, all digitized areas were close to original computed areas. Except for

elevation 1890, it is assumed that the difference was due to the quad map scale (one inch equals

two thousand feet) and the different methods of digitizing the areas.

The elevation 1,890.0 contour that was digitized from USGS quad maps was used to perfonn a

clip of the Webster Reservoir triangular irregular network (TIN) such that interpolation was not

allowed to occur outside the 1,890.0 contour. This complete contour was selected since it was

the closest complete elevation to represent the reservoir at the time of the survey. This clip was

performed using the hardclip option of the ARC/INFO CREATETIN command. Using

ARCEDIT, the underwater collected data and digitized contours from the quad maps were

plotted. The plot found that the underwater data did not completely lie within this clip, which•

would require some modifications to include the entire underwater data set. These areas included

the north and south shores of the reservoir downstream of the state park and at the left abutment

of the dam where the spillway inlet channel exists. Conversations with the reservoir

superintendent confirmed that there has been some shoreline erosion since the reservoir fill in

1993, which accounts for the north and south shore areas. Using select and move commands

within ARCEDIT, the vertices of the 1890.0 clip were shifted to fit all the collected underwater

data. The underwater data and the contour topography are presented on figure 4.

Contours for elevations below 1,890.0 were computed from collected underwater data using the

TIN surface modeling package within ARC/INFO. The underwater survey data were collected in

the Kansas north zone state plane coordinates in NAD 1927 (a TIN is a set of adjacent, nonoverlapping triangles computed frOm irregularly spaced points with x,y coordinates and z

values). TIN was designed to deal with continuous data such as elevations. The TIN software

uses a method known as Delaunay's criteria for triangulation. Triangles are formed between all

data points including all bounda±y points. This method preserves all collected survey points.

The method requires that a circle drawn through the three nodes of a triangle will contain no

other point, meaning that sample points are connected to their nearest neighbors to form triangles

using all collected data. Elevation contours are then interpolated along the triangle elements.

The TIN method is discussed in great detail in the ARC/INFO V7.0.2 Users Documentation.

In creating the TIN, points that fell within a set distance of each other were weeded out to

eliminate flat triangular elements (flat triangles occur where all three points making up a triangle

have the same elevation). Elimination of redundant points helped to improve the performance of

the contouring process and helped create more continuous contours in the lower elevations of the

reservoir.

The linear interpolation option of the ARC/INFO TINCONTOUR command was used to

interpolate contours from the Webster Reservoir TIN. In addition, the contours were generalized

by weeding out vertices along the contours. This generalization process improved the

presentability of the resulting contours by removing very small variations in the contour lines.

This generalization had little bearing on the computation of surface areas and volumes for

Webster Reservoir. The contour topography at 4-foot intervals, from elevation 1852 to 1890 is

7
presented on figure 5, thawing number 468-D-457. Contour elevations 1910 and 1924 are the

digitized results for the USGS quad maps.

Development of 1996 Contour Areas

The 1996 contour surface areas for Webster Reservoir were computed at 1-foot increments, from

elevation 1,849.4 to 1,880.0, using the Webster Reservoir TIN discussed above. The 1996

survey measured the minimum reservoir elevation at 1,849.4 feet. These calculations were

performed using the ARC/INFO VOLUME command. This command computes areas at userspecified elevations directly from the TIN and takes into consideration all regions of equal

elevation. As discussed in the survey method and equipment section, large areas of the

underwater portion of the reservoir were not surveyed due to the thick tree growth. This

accounts for the fact that the 1996 areas were only computed for elevation 1,880.0 and below.

Several variations of the TiN were developed using different clip options, including larger clips

and assigning no elevation to the clip. The resulting computed areas from all these options were

virtually the same for elevation 1880 and below due to the lack of collected data in the thick

vegetated areas. The fmal 1996 area computations assumed no change from the original surface

area from elevation 1890 and above.

1996 Storage Capacity

The storage-elevation relationships based on the measured surface areas were developed using

the area-capacity computer program ACAP85 (Bureau of Reclamation, 1985). Surface areas at

2-foot contour intervals from minimum reservoir elevation 1,849.4 to elevation 1,880.0 and the

original surface areas at 2-foot contour intervals from elevation 1,890.0 and 1,938.0 were used as

the control parameters for computing Webster Reservoir capacity. The program can compute an

area and capacity at elevation increments 0.01- to 1.0-foot by linear interpolation between the

given contour surface areas. The program begins by testing the initial capacity equation over

successive intervals to ensure that the equation fits within an allowable error limit, which was set

at 0.000000 1 for Webster Reservoir. This capacity equation is then used over the full range of

intervals fitting within this allowable error limit. For the first interval at which the initial

allowable error limit is exceeded, a new capacity equation (integrated from basic area curve over

that interval) tests the fit until it also exceeds the error limit. Thus, the capacity curve is defined

by a series of curves, each fitting a certain region of data. Final area equations are derived by

differentiating the capacity equations, which are of second order polynomial form:

y a1 + a-,x + a3x2

where:

y capacity

x = elevation above a reference base

a1 intercept

a-, and a3 coefficients

8
Results of the 1996 Webster Reservoir area and capacity computations are listed in table 1 and

columns (4) and (5) of table 2. Listed in columns (2) and (3) of table 2 are the original surface

areas and recomputed capacity values. A separate set of 1996 area and capacity tables has been

published for the 0.01-, 0.1-, and 1-foot elevation increments (Bureau of Reclamation 1996). A

description of the computations and coefficients output from the ACAP85 program is included

with these tables. Both the original and 1996 area-capacity curves are plotted on figure 6. As of

May 1996, at elevation 1,892.45, the surface area was 3,767 acres with a total capacity of 76,157

acre-feet and an active capacity of 71,926 acre-feet.

SEDIMENT ANALYSES

Sediments have accumulated in Webster Reservoir to a total volume of 1,267 acre-feet since dam

closure in May 1956. This volume was calculated at reservoir spillway crest elevation 1,884.6.

It must be noted that the 1996 underwater survey was conducted at around water surface

elevation 1894.8 and that the final product relied on the original measured surface areas at

elevation 1890.0 and greater for computing the 1996 reservoir area and capacity tables. Column

6 of table 2 gives the measured sediment volume by elevation and illustrates that the majority of

the deposit is in the lower elevations of the reservoir. Of the total measured deposited sediment

of 1,267 acre-feet, 1,069 acre-feet were deposited in the inactive pool storage areas and 198 acrefeet in the active pool storage areas. The average annual rate of sediment deposition between

closure and May 1996 (40.0 years) was 31.7 acre-feet per year. The storage loss in terms of

percent of original storage capacity was 1.64 percent. Table 1 and 2 contain the Webster

Reservoir sediment accumulation and water storage data based on the 1996 resurvey.

Reclamation's original 50-year sediment deposition prediction was 9,300 acre-feet, of which

6,697 acre-feet were projected to settle above elevation 1860.0. The 1996 study found very little

sediment accumulation within Webster Reservoir considering the size of the drainage basin.

Prior to reservoir impoundment, a sediment range line network was established for monitoring

sediment inflow (figure 7). Figures 8, 9, and 10 show plotted results of several range line

surveys for range line 2, 3, and 4. Range line 2, surveyed in January of 1985, showed no change

except in the original channel area. The original channel bottom was around elevation 1848 and

the 1985 survey measured the bottom at approximately elevation 1856. Range line 3, surveyed in

September 1968 and February 1979, showed little change between surveys except at the left bank

above elevation 1885, indicating bank erosion and the sediment accumulated in the original

channel area.. The original channel bottom was approximately elevation 1854, with the 1968

survey measuring the bottom at around elevation 1859 and the 1979 survey measuring the bottom

at around elevation 1861. Range line 4, surveyed in September 1968 and February 1979, also

showed little change between surveys except for channel sediment accumulation and right bank

erosion. The original channel bottom was around elevation 1868 and the 1968 and 1979 surveys

measured the bottom at around elevation 1873. Visually locating the range lines on the resulting

1996 contour map also indicated that there has been little bottom change in the lower original

channel portions of the reservoir.

Table I may give some clues as to why the sediment accumulation is lower than original

projections. Item 23 shows that the mean annual runoff of the basin for the 40-year period of

record was only 0.6 inches. Lovewell Reservoir, located on White Rock Creek around 85 miles

9
northeast of Webster Reservoir, had a calculated mean annual runoff of 3.4 inches. Webster

Reservoir drainage basin has a much lower runoff, reflecting the lower sediment contribution.

Additional factors are illustrated in item 45 of table I and on figure 3, which depicts the range of

reservoir operation. The reservoir has operated at near full conditions (above elevation 1890) in

a few years, but in many years the reservoir has operated at low reservoir content, below

elevation 1870, and in a few years it has operated even in the inactive zone, below elevation

1860. These low reservoir operating conditions probably have moved some of the upper

reservoir accumulated sediments toward the dam so that they are eventually flushed downstream

through the outlet works.

10
REFERENCES

American Society of Civil Engineers, 1962. Nomenclature for Hydraulics, ASCE Headquarters,

New York.

Bureau of Reclamation, 1981. Project Data, Denver Office, Denver, CO.

Surface Water Branch, 1985. ACAP85 User's Manual, Technical

Service Center, Denver, Colorado.

1987. Design of Small Dams, U.S. Government Printing Office, Denver,

CO.

__________________ 1987. Guide for Preparation of Standing Operating Procedures for

Bureau of Reclamation Dams and Reservoirs, U.S. Government Printing Office, Denver,

CO.

____________ May 1996. Denver Office, Webster Reservoir Area and Capacity Tables,

Bostwick Division, Great Plains Region, Denver, CO.

Corps of Engineers, March 1991. Application ofDqfferential Global Positioning System for

Hydrographic Survey and Dredge Positioning, ETL 1110-7-5 (FR), Department of the

Army, Washington, DC.

Environmental Systems Research Institute, Inc., 1992. ARC Command References.

11
RESERVOIR SEDIMENT

DATA SUMMARY Webster Reservoir

NA94E OF RESERVOIR

DATA SHEET NO.

D 1. OWNER Bureau of Reclamation 2. STREAM South Fork Solomon River 3. STATE Kansas

A 4. SEC. 3 TWP. 8S RANGE 19W 5. NEAREST P.O. Stockton 6. COUNTY Rocks

M 7. LAT 39" 23' 29" LONG 99" 25' 33" 8. TOP OF DAM ELEVATION 1,944.0 9. SPILLWAY CREST EL. 1884.6'

R 10. STORAGE 11. ELEVATION 12. ORIGINAL 13. ORIGINAL 14. GROSS STORAGE 15. DATE

E ALLOCATION TOP OF FOOL SURFACE AREA, AC CAPACITY, AR ACRE- FEET STORAGE

s BEGAN

a. SURCHARGE 1,938.0 11,270 140,910 401,650

v b. FLOOD CONTROL 1,923.7 8,480 183,370 260,740 5/03/56

O c. POWER

I d. WATER SUPPLY 1,892.45 3,767 72,070 77,370 16. DATE

R a. IRRIGATION ORMAL

f INACTIVE 1 860 0 906 3 116 5 300

OPERtTI0N

. , . , ,

g. DEAD 1,855.5 473 2,184 2,184 5/58

17. LENGTH OF RESERVOIR 62 MILES AVG. WIDTH OF RESERVOIR 1.0 MILES

B 18. TOTAL DRAINAGE AREA 1,150 SQUARE MILES 22. MEAN ANNUAL PRECIPITATION 23.7 INCHES

A 19. NET SEDIMENT CONTRIBUTING AREA 1,150 SQUARE MILES 23. MEAN ANNUAL RUNOFF 0. 6 INCHES

20. LENGTH MILES ÀY. WIDTH MILES 24. MEAN ANNUAL RUNOFF 36,598 ACRE-FEET

__

21. MAX. ELEVATION 3,460 WIN. ELEVATION 1,860 25. ANNUAL TEMP. MEAN 54"F RANGE -22"F to 112"F6

S 26. DATE OF 27. 28. 29. TYPE OF 30. NO. OF 31. SURFACE 32. CAPACITY 33. C/I

U SURVEY PER. ACCL. SURVEY RANGES OR AREA. AC. ACRE-FEET RATIO AR/AR

R _________________ ______________ ______________________________________________ _______________________________

V

E 5/03/56 Contour (D) 2-ft 3,767' 77,370' 2.11

Y

5/19/96 40.0 40.0 Contour (D) 2-ft 3,7678 76,1578 2.08

A

26. DATE OP 34. PERIOD 35. PERIOD WATER INFLOW, ACRE FEET WATER INFLOW TO DATE, AR

T

SURVEY ANNUAL ___________________________________________ _____________________________

A

PRECIP. a. MEAN ANN. b. MAX. ANN. c. TOTAL a. MEAN ANN. b. TOTAL

5/19/96 23.7 36,598 157,300 1,463,900 36,598 1,463,900

26. DATE OF 37. PERIOD CAPACITY LOSS, ACRE-FEET 38. TOTAL SEDIMENT DEPOSITS TO DATE, AR

SURVEY _________________ _____________________________________________________

a. TOTAL

__________________

b. Ày. ANN.

________________

c. /MI.'-YR. a. TOTAL b. AV. ANNUAL C. /MI.'-YR.

5/19/96 l,267 31.7 .03 1,267 31.7 .03

26. DATE OF 39. AV. DRY 40. SED. DEP. TONS/MI.'-YR. 41. STORAGE LOSS, PCI. 42. SEDIMENT

SURVEY WT. (#/FT") _________________________________ __________________________________________________

a. PERIOD b. TOTAL TO a. AV. b. TOTAL TO a. b.

5/19/96 .041 l.64

26.

DATE

43. DEPTH DESIGNATION RANGE IN FEET BELOW ELEVATION

OF

SURVEY

34.6-

45.6

24.6-

34.6

14.6-

24.6

4.6-

14.6

Crest

-4.6

PERCENT OF TOTAL SEDIMENT LOCATED WITHIN DEPTH DESIGNATION

5/96 47.4 37.0 -17.5 32.4 0.7

26. 44. REACH DESIGNATION PERCENT OF TOTAL ORIGINAL LENGTH OF RESERVOIR

DATE

SURVEY

0-10 10-

20

20-

30

30-

40

40-

50

50-

60

60-

70

70-

80

80-

90

90-

100

100-

105

105-

110

110-

115

115-

120

120-

125

PERCENT OF TOTAL SEDIMENT LOCATED WITHIN REACH DESIGNATION

Table 1. - Reservoir sediment data summary (page 1 of 2).

12
45. RANGE IN RESERVOIR OPERATION'0

YEAR MAX. ELEV. MIN. ELEV. INTL0w, AT YEAR MAX. ELEV. MIN. ELEV. INFLOW, AT

1956 1,857.6 1,839.9 6,300

1957 1,899.6 1,855.2 128,500 1958 1,895.6 1,886.1 67,000

1959 1,894.6 1,888.0 24,-lOG 1960 1,896.1 1,888.2 69,400

1961 1,899.7 1,884.2 87,700 1962 1,898.0 1,886.8 127,500

1963 1,890.4 1,886.0 43,700 1964 1,889.9 1,879.1 20,300

1965 1,890.4 1,879.0 64,700 1966 1,891.0 1,876.0 17,700

1967 1,877.9 1,869.7 11,300 1968 1,872.0 1,861.6 18,000

1969 1,879.0 1,866.8 38,400 1970 1,877.1 1,863.7 12,800

1971 1,868.8 1,857.4 12,100 1972 1,863.4 1,857.4 9,700

1973 1,873.6 1,863.1 34,100 1974 1,879.6 1,868.5 22,400

1975 1,886.3 1,868.6 52,500 1976 1,882.8 1,867.9 11,300

1977 1,871.7 1,861.4 14,900 1978 1,873.0 1,865.3 21,600

1979 1,879.6 1,871.7 21,600 1980 1,875.2 1,864.0 11,200

1981 1,867.8 1,863.8 7,500 1982 1,870.9 1,864.6 10,900

1983 1,872.7 1,860.9 8,800 1984 1,868.8 1,860.8 12,700

1985 1,868.7 1,866.4 6,400 1986 1,873.0 1,866.6 15,200

1987 1,880.1 1,867.4 31,600 1988 1,880.1 1,871.5 6,900

1989 1,871.5 1,864.8 10,700 1990 1,872.4 1,866.0 12,100

1991 1,867.3 1,858.7 4,500 1992 1,864.0 1,859.2 8,000

1993 1,904.3 1,864.0 143,700 1994 1,897.0 1,892.8 61,800

1995 1.907.0 1892.0 157.300 1996 1.894.8 1.893.7 17.000

46. ELEVATION - AREA - CAPAcITY DATA FOR 1996 CAPAITY'1

ELEVATION AREA CAPACITY ELEVATION AREA CAPACITY ELEVATION AREA CAPACITY

1849.4 0 0 1850 2.0 1 1852 188.0 166

1854 326.9 681 1856 477.7 1,486 1858 682.0 2,645

1860 904.1 4,231 1862 1,087.9 6,223 1864 1,250.7 8,562

1866 1,390.0 11,203 1868 1,507.4 14,100 1870 1,648.0 17,255

1872 1,790.2 20,684 1874 1,929.0 24,393 1876 2,099.5 28,421

1878 2,274.6 32,795 1880 2,460.7 37,531 1890 3,487 67,269

1892.45 3,767 76,157 1894 3,939 82,129 1898 4,425 98,843

1902 4,832 117,380 1906 5,400 137,742 1910 6,010 160,532

1914 6,730 185,932 1918 7,425 214,267 1923.7 8,478 259,610

1928 9,315 297,797 1932 10,045 336,567 1938 11,270 400,422

47. REMP,P.KS AND REFERENCES -

' Top of spillway radial gates is elevation 1923.7.

2 Length at reservoir elevation 1890.0 from USGS quad maps of reservoir.

Average precipitation at Webster Dam, 1955-1996, measured at Bureau of Reclamation gag e.

Calculated using mean annual runoff value of 36,598 AT, item 24.

Computed inflows from the South Fork Solomon River, 5/56 through 5/96.

S Bureau of Reclamation Project Data Book, 1981.

Original surface area and capacity at elevation 1,892.45, top of water supply. Original capacity recomputed by

Reclamation's ACAP program using original surface areas.

8 Surface area and capacity at elevation 1892.45 computed by ACAP program using 1996 and original surface areas.

1996 surveyed only underwater portion of reservoir below elevation 1890.0, but heavy vegetation restricted

adequate data collected to elevation 1880 and below. Elevation 1890.0 and above from original measured areas.

Total capacity loss calculated by comparing original recomputed capacity and 1996 capa city at reservoir elevation

1884.6, spillway crest elevation.

10 Maximum and minimum elevations and inflow values in acre-feet by calendar year, from 5/56 through 5/96.

Capacities computed by ACAP computer program. Areas at elevation 1890 and above from original survey.

48. AGENCY MRKING SURVEY Bureau of Reclamation

49. AGENCY SUPPLYING DATA Bureau of Reclamation DATE Augnst 1997

Table 1. - Reservoir sediment data summary (page 2 of 2). 13
Table 2 - Simuary of 1996 survey results.

(1)

Elevation

(feet)

(2)

Original

Area

(acres)

(3)

Original

Capacity

(acre-feet)

(4)

1996

Area

(acres)

(5)

1996

Capacity

(acre-feet)

(6)

Measured

Sediment

Volte

(acre-feet)

(7)

Percent

Measured

Sediment

(8)

Percent

Reservoir

Depth

1938.0 11.270 401,636 11.270 400,422 - - 100.0

1930.0 9.700 318,026 9.700 316,812 - - 91.9

1923.7 8.478 260.723 8.478 259,510 - - 85.6

1920.0 7.790 230.696 7.790 229.482 - - 81.8

1910.0 6,010 161.746 6.010 160.532 - - 71.7

1900.0 4.640 109,122 4.640 107.908 - 61.6

1892.45 3,467 77.370 3.767 76.157 - - 54.0

1890.0 3.487 6L483 3,487 67.269 - - 51.5

1884.6 2.922 51,203 2.933 49.936 1,267 100.0 461

1878.0 2,311 33,991 2.275 32.795 1.196 94.4 39.4

1874.0 1,967 25.407 1.929 24.393 1.014 80.0 35.4

1870.0 1.678 18.102 1,648 17.255 847 66.9 31.3

1866.0 1,368 12.014 1.390 11.203 811 64.0 27.3

1862.0 1.048 7,254 1,088 6.223 1.031 81.4 23.2

1858.0 723 3.671 682 2.645 1.026 81.0 19.2

1855.5 473 2.183 440 1.256 927 73.2 16.7

1850.0 154 602 2 1 601 47.4 11.1

1846.0 72 140 0 0 140 11.0 7.1

1842.0 8 10 0 0 10 0.8 3.0

1839.0 0 0 0 0 0 0 0.0

(1) Elevation of reservoir water surface.

(2) Original reservoir surface area.

(3) Original calculated reservoir capacity ccuted using ACAP from original measured surface areas.

(4) Reservoir surface area from 1996 survey for elevations 1880 and below. Areas for elevation 1890

and greater are original measured areas.

(5) 1996 calculated reservoir capacity cxiuted using ACAP. from 1996 surface areas.

(6) Measured sediment volitue colLmm (3) - colurm (5).

(7) Measured sediment expressed in percentage of total sediment 1.267 acre-feet at elevation 1884.6.

(8) Depth of reservoir expressed in percentage of total depth (99 feet).

Note: The 1996 survey developed updated underwater reservoir topography from elevation 1880.0

and below. Surface areas at elevation 1890 and above are original measured areas.

14
V41.4t41.

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IRRIGATION AND FLOOD CONTROL FACILITIES 1

DIVISION UNIT

AM

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P4.siCIty 20 30 DWG. NO, 60-701-250

SCALE 4, NN,U

15
Space intentionally left blank due to security concerns 
1910

1900

1860

TOP OF CONSERVATION = 1892.45

1890

m C

-• ° 18

U.'

1870

Webster Reservoir

1850 I I I I I I I I I I I I

August 1956 - May 1996

TOP OF INACTIVE = 1860.0
N

w

S.

S

F's,

a iooo

F

4000001 400000-4

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O8AN8________ T[t'/C4L APP8OVAL

E'EO 81 APMft?VFD_

Denver. L'o/crcdo FF8 0!. 1997

Area-Capacity Curves for Webster Reservoir

Area (acres)

12000 10000 8000 6000 4000 2000

1940

1930

1920

1910

•; 1900

C,

I.-

.2 1890

LU 1880

1870

1860

1850

1840

1830

0

cl Aa

7tTiiIli1____

_

[-;:---;-- Original Survey

1996 Survey

0 50000 100000 150000

C-)

200000 250000 300000 350000 400000 450000

Capacity (acre-feet)
LOCATION OF BRASS CAP MONUMENTS 5LT RANGES MAGNETIC SEARING MEASURED D51ANCE _____________________________________

I C mGuflt 35ft. odh of •os ond wist fsnce. 3 L north R R t R fL N OV 40 W 202857 I l

e sail and -*I cad, 12.Oft. .øs of gate nto fI,id, 240.0 f 8 2R to R ZL N 6 09' 52 W 2982.35

wilt of f.ac. con.r, 550.Oft. .øs of southwest cornar of 3R c t. N 02 29' 45' W 836060

•4Gt(Oi t2 T7S. R19W, R 4R $o R 4L N 00 3" 55MW 8015.27

. P 5R to R SL N 0t 52 17"E 7997.58 • I

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R 6R to R 61. N 40 25 52

'

8269.04

R 7Rto P 7L N5054 l4W 661225 --19------ 20- 21 \1 22 3- - -

co.ft.r $sC.4 taC.3 185. R 9W 8R to 8L N

64d05' 43MW 3955.65 i. \L_-WEBSTER

R 9R to R 91. N 25 53' 49 5974.70 ' . w DIKE

.. .0L B.C. mO.umIflt O top of hIll cjItløt.d field, 10.0 ft north of R 20R to R ZOL N 6 38' O7E I84. 33 con.r of $C-28, r;'7:

30R tO P 30L N 71 33 24MW 4577.10 I . 1 .

. ...

•'

•

S.C. moIn? on top of hill In pctu 0.5ff. eo,t noflh and . ____________________________ I ! ••

R IL

,outtt f.nc. ins, 42.Oit. •ot Of oorth and 3outh rood, 62.Oft.

___________________________

. ___________________________ ---- -- . . .

.,orthw•st of eo,cr.t. block gron*ry 8620ff normeolt of /4 I I :

. - cornir 9 & tO. 16$. P 19W. Møn,tlc Baorng from /4 conl.r .. i

* & 10 to R ZR Is north 7•.ast. ..-...

.

IA BC. monum.n, 2.0ff. south of tsrce post in fence Its., 35.0 Il. west •

of north and south .oad, 46.0 ft. south of last and went road,

U.S ft. southw.st of northCast corn.r of ss 32, 175. 619W. - - - -

- ----26---- ---25---- ---30 ------ -- --29--- -,.---28-±--- - -27 - ---26- -- T7S

S.C. monument set In east & west (/4 Itt. sac. 32, 4260ff. west

of /4 corner sec. 32833 175. 69W.

S.C. monument In north and south fence lIne, 5.0 ft. loSt of north

-

. '.5 I I

.•

and south fraIl, 378.0ff. sOuth of nortftw.st corner of sectIon 9, ' •1 .' 'V .WE8 R 0 M

TSS.RI9W. ' .. .•' . •' :

'

-

_________ RZ0P . 20w. ____________

S.C. monument In pasture, 350.0 ft. sautheost of cI/4 corner I •. '

_________ ____________________

'. •"• !" '' SeC. 34, ltZ.Oft. lost of north and south tinGe southeott 1/4 of ' " .•. I eeC. 34, 775. 6t9W. Magnetic SearIng from ct,'$ co,aer sec. SI to ',

.,. I ' " '.'.

'

A St. Is South 42 30' east. ,

", J ' I

I I ' I

R30(_ £42 B. C. monument on tap of tull n pasture, appr. 725.0 ft.

.ast of north and south f 100 0 ft n rtheast of 61/4

,,, .. . ',

% :

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36

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-

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- -31- - • -32- - - - 3- - - -- 34 _--35_ - -

1* S C monument cue n g In posture 3 Stt north of east I ./ SOTH SOLOMON ...' -•..-,-.-,-. ' I •'

. . cor er sec , . . ' I

t f I f f d t f tI + R 7L / RIVER \t""' ' 1 end wes ence n., 2.0 f. east o north an sou h ence ne o c . '.•: ':

4/4 corner uc.S 189. 619W

, ....., I :'

, ,• .,

"

... , ,

,t•. , .

I

,

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.

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;:: end west f.nc. In: 04 flO Ord sot,Th ne, ___________________

/ I _________

R 2f

______ _____________ . C I

A 20*. I // I

________ _________

RWW OW

BC. moeuaterst tn east and want fence lIne, 290 ft. north of east I

'i I

end west rood, 46.1 ft northeast of 1/4 corner sec. t 3 sec. 12, - -

i'.:

-' I RIR

I

BC. moaumenf on top rock molt, east of north 054 south trait, i i' . I ' . I

lbOutI.Sft.westofshrthandsouthfence,obou$t570.Oft. _5I" _ '"_ -4 4".

"

-I ------ .

South of northeast corner of nec. 35, 1 iS. 619W. '

- - - 5 - ..........4 -- --3_ - - 2

I I

. I _--

-"-

------------- I •R 16 8.C.monument 1/4 corner s.c. 382 maSt eda of trotl, / ---.--- I I I

56.Oft. lost of fence carter, 185. #20W.

1

:' / "' t

I "'

I

S.C. monument 8.0ff. east of north ond south fence in pOsture, /

'/ ; I

I .

south of 1/4 corner betwean sec. 33 3 34, R 9L '

I • R 5R j I I

" 'k

I

- SC. monument anor. 200.0 ft. weSt southwest of northeast I

'R 8L

___________

I

.

.

'..'•'4.

.. ________________ I .

_______ I '. R

I

____________

I

co,s.r of sec. 9, tS.O ft. south of east ond west fence tine. / •• I

,,. ' I I . II

L

-

-

'

TSS.AZOW. / :. I

!1I I

SC monument a posture about (000 Oft south southwest of / DAALAAI BRIDGE

"

.

I ' I I

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II ,tI'1T "-_ I

' R 2R

Silo, about 800ff west of steep bank of drols, about 500.0 ft a.- PROFILE •. • R BR • I I

'

I I II • • . '

•• 0

... •eetofriverbank,oppr.2500.Ofl.southwaslsfnortheast 8-"' - 94h' - - - tI- -HF----I2-4.I'-7I'-"..' - - ''' g'" ---10-- - --II- - -

career of eec tO, TSS. 620W ,:

-

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"

:' R 30R

S C monument on top of sand hill 000 Oft northwest of north

'

4/4 corner sec.9, T8S. 620W, i .' I I

- 1' • I

'SI B.C. monument In pasture on top of hill on north side of east . .

..

'l••••'•••, •

-

,

,

•'•: I I

and watt raad, about 13.0 ft. north of cost and west fence,

' 6 6 I ''•"--. .' : I I I ObOut a 1000.0 ft. west of southeast corner of s.c. 8, lBS. #19W.

- i i ' "

.

, I r

_________________________ __________________________

., I . , -_

__________________________ 18S

-------------

----------------

------------------ ........................................................

I -

I

-16- - -

I

- I

- --15- -

I

1000 5000 4000

SCALE Of fEET --18 - -

-

-16- -

Top of Flood Control Pool 4923.7

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UNITED STATES

mc INTERIOR F i 7 SusEAu or Aw.AWATI0N

MISSOURI RIVER BASIN PROJECT

SOLOMON DIVISION KANSAS

- WEBSTER DAM -

PLAN OF SILT RANGES IN RESERVOIR

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SEOIMENT RANGE NO.3

900 ---- -

--

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--- -----L---- H H L

188C ------

- - 1

870 -- - -- _____ 1870

000 s+oo 20+00 25+00 301-00 75400 40 00

900 -

I H

H

I -

4900

4890 -- __ __ __-__ __ _____ __ __ __ __ __ __

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890

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I

-- -- - -

r -

880 ------ ---

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-- -- ---------- 1880

- - H

870 --------

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70+0

860 ---- I __ ____ - - - 860

-

- 1- - - J U*,t(O 5T47(8

---i/4 : I / J AMA Fl 9

850 L -

40+00

J 45*00 50 F 00

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55400

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8U* AUO H*, I O+

9

_-_---- __---_---- -- -1850

60+00 6fl)+ 00 fl[OMON 7flflflON - .*€uS 51-

OflQlefl)I Srve5 WEBSTER RESER'+OIR

Sept. 968 s*re 5dfltarfl a4iofl RQnfl 50 3

Feb 979 Sur4/ --

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McCOO6,NEBR 2 -*6-70 1468-7CtVO7

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23

RECLAMATION'S MISSION

The mission of the Bureau of Reclamation is to manage, develop, and protect water and

related resources in an environmentally and economically sound manner in the interest of

the American Public.